test: fix version requirement of tokio-stream

[robjtede]

Motivation

cargo minimal-versions check (taiki-e/cargo-minimal-versions) should succeed on a project with tokio-test as a dependency.

Currently fails here:

...
    Checking tokio-stream v0.1.0
    Checking tokio-test v0.4.2
error[E0432]: unresolved import `tokio_stream::wrappers`
  --> /Users/rob/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-test-0.4.2/src/io.rs:24:19
   |
24 | use tokio_stream::wrappers::UnboundedReceiverStream;
   |                   ^^^^^^^^ could not find `wrappers` in `tokio_stream`

error[E0599]: no method named `poll_next` found for struct `Pin<_>` in the current scope
   --> /Users/rob/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-test-0.4.2/src/io.rs:206:32
    |
206 |         Pin::new(&mut self.rx).poll_next(cx)
    |                                ^^^^^^^^^ method not found in `Pin<_>`
    |
    = note: `Pin::new(&mut self.rx)` is a function, perhaps you wish to call it
...

Solution

Use the correct minimal version of tokio-stream which appears to be 0.1.1 when the wrappers module was introduced.

[Darksonn]

Thanks.